Business data communications 5e by stallings chapter 01

Chapter 1: IntroductionBusiness Data Communications, 5e... Information & Communication• Networking is critical to the new corporate structures emerging in today’s businesses • Benefits o

Chapter 1: Introduction

Business Data Communications, 5e

Information & Communication

• Networking is critical to the new corporate structures emerging in today’s businesses

• Benefits of good networks

– make geographically dispersed companies

more manageable

– help top-heavy companies trim down middle management

– help companies break down barriers between divisions

Trends Driving Data Communication

• Traffic growth

– Voice & data; local and long distance

• Development of new services

– In turn drives increased traffic

• Advances in technology

– Encourage and support increased growth and development

Key Technology Trends

• Faster and cheaper computing and

communications

• Increasingly “intelligent” networks

• Growing importance of Internet, intranet and extranet applications

• Increasing use of and dependence on

mobile technology

Business Drivers

• Applications

• Services

• Management

• Infrastructure

Business Information

Requirements

• Voice communications

• Data communications

• Image communications

• Video communications

The Internet &

Distributed Applications

• Key infrastructure for supporting

distributed applications

• Internet, including intranets and extranets

• TCP/IP protocol suite

• Distributed applications

• Client-Server Architectures and Intranets

Network Types

• Wide Area Networks

– Circuit Switched

– Packet Switched

– Frame Relay

– ATM

• Local Area Networks (LANs)

• Wireless Networks

• Metropolitan Area Networks

Transmission of Information

• Transmission and transmission media

– e.g twisted pair, fiber, wireless, coax

• Communication Techniques

– encoding, interface, protocols

• Transmission efficiency

– multiplexing, compression

Management Issues

• Network Security

• Network Management

Communications Standards

• Importance

• Process

• Organizations

• Web Sites

• Usenet Newsgroups

• Journals

– Business-oriented

– Technical

• Uses electricity to transmit messages

• Speed of electricity dramatically extends reach

– Sound waves: ~670 mph

– Electricity: ~186,000 (speed of light)

• Bandwidth= information-carrying capacity

of a channel